Linear Technology DC1765A Demo Manual

Description

DEMO MANUAL DC1765A

LTC6957-1/LTC6957-2

Low Phase Noise, Dual LVPECL or LVDS

Output Buffer/Driver/Logic Converter

Demonstration Circuit 1765A features the LT C®6957-1/

LTC6957-2, a low phase noise, dual LVPECL or LVDS

output buffer/driver/logic converter.

The DC1765A provides 0.5" spaced SMA connectors for the differential inputs and outputs. The inputs are terminated to on-board 50Ω resistors. The LVPECL outputs of the DC1765A-A are individually biased through 130Ω resistors to ground and then AC-coupled. The transmission lines are 50Ω, making the outputs suitable to drive 50Ω input impedance instruments. The LVDS outputs of the DC1765A-B are terminated with 100Ω differential

and are DC-coupled. The DC1765A allows the user to take advantage of the shutdown and bandwidth selection features of the LTC6957. The DC1765A can operate with a single-ended or differential sine wave or square-wave input signal. Supply the DC1765A with 3.3V and it is ready to function. The DC1765A offers extra component population options to make it compatible with different logic signal types.

Design files for this circuit board are available at

http://www.linear.com/demo

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

Figure 1. DC1765A Inputs and Outputs

dc1765af

1

DEMO MANUAL DC1765A

Quick start proceDure

The DC1765A is very straightforward to operate. Refer to Figure 1 for the following discussion.

DC1765A Configuration

1. Apply a low-noise and low-spurious 3.3V supply between the V+ (E1) and GND (E2) turrets.

2. Connect a low phase-noise (or jitter) single-ended or differential input signal to IN+ (J1) and/or IN– (J2) SMA connectors. Refer to the LTC6957 data sheet for appropriate input signal types and levels.

3. Connect either of the outputs (OUT1, J3 and J4 or OUT2, J5 and J6) to a high-speed scope, spectrum analyzer or a signal analyzer to start the evaluation of the LTC6957.

4. Configure the input bandwidth of the LTC6957 with the use of FILTA (JP1) and FILTB (JP2) jumpers. Follow the instructions given in the LTC6957 data sheet to choose the correct bandwidth given an input signal.

5. Shut down an unused output by using jumper SD1 (JP3) to shutdown OUT1 or jumper SD2 (JP4) to shutdown OUT2.

DC1765A Reconfiguration

The DC1765A is flexible and allows the connectivity of a variety of input and output signal types. The DC1765A is configured as shown in the schematic diagram. However, the DC1765A allows the installation of different input and output configurations to adapt to a variety of logic signals. Refer to the Applications Information section of the LTC6957 data sheet for all possible connectivity options that can be implemented by modifying the DC1765A.

2

dc1765af

DEMO MANUAL DC1765A

assembly options

Table 1. DC1765A Assembly Options

ASSEMBLY VERSION PART NUMBER OUTPUT TYPE

DC1765A-A LTC6957HMS-1 LVPECL

DC1765A-B LTC6957HMS-2 LVDS

layout top layer

The top metal layer of the DC1765A is shown here as an example of good PCB layout for the LTC6957-1/LTC6957-2.

dc1765af

3

DEMO MANUAL DC1765A

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC1765A General BOM

1 2 C6, C8 CAP., X7R, 0.01µF 50V 10%, 0603 NIC, NMC0603X7R103K50TRP

2 1 C13 CAP., X7R, 0.1µF 50V 10%, 0603 TDK, C1608X7R1H104K

3 1 C14 CAP., X5R, 1µF 25V 10%, 0603 TDK, C1608X5R1E105K

4 1 C16 CAP., TANT, 22µF 10V, 3528 AVX, TPSB226K010R0400

5 2 E1, E2 TESTPOINT, TURRET 0.094" MILLMAX, 2501-2-00-80-00-00-07-0

6 4 JP1, JP2, JP3, JP4 HEADER 1×3 079 SAMTEC, TMM-103-02-L-S

7 6 J1, J2, J3, J4, J5, J6 CONN., SMA 50Ω EDGE-LAUNCH E.F. JOHNSON, 142-0701-851

8 0 R6, R11, R14 RES., OPT 0603 OPT

9 2 R7, R15 RES., CHIP, 49.9Ω 1% 0603 VISHAY, CRCW060349R9FKEA

10 4 R16, R17, R18, R19 RES., CHIP, 330k 1% 0603 VISHAY, CRCW0603330KFKEA

11 4 SHUNTS FOR JP1-JP4 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G

12 4 STAND-OFF, NYLON 0.500 KEYSTONE, 8833 (SNAP ON)

DC1765A-A

1 1 DC1765A GENERAL BOM DC1765A

2 4 Z1, Z2, Z3, Z4 CAP., X7R, 0.01µF 50V, 0603 NIC, NMC0603X7R103K50TRP

3 4 R1, R2, R3, R4 RES., CHIP, 130Ω, 0603 VISHAY, CRCW0603130RFKEA

4 0 R20, R21 RES., 0603 OPT

5 1 U1 IC, LTC6957HMS-1, MS12 LINEAR TECH., LTC6957HMS-1

DC1765A-B

1 1 DC1765A GENERAL BOM DC1765A

2 4 Z1, Z2, Z3, Z4 RES., CHIP, 0Ω, 0603 VISHAY,

3 0 R1, R2, R3, R4 RES., 0603 OPT

4 2 R20, R21 RES., CHIP, 100Ω 5%, 0603 VISHAY, CRCW0603100RJNEA

5 1 U1 IC, LTC6957HMS-2, MS12 LINEAR TECH., LTC6957HMS-2

CRCW06030000Z0EA

4

dc1765af

schematic Diagram

11

OUT1+

J3

SMA-R

SD1

OUT1+

*

Z1*Z1

H

SMA-R

R1*R1

*

L

JP3

132

1

2

MICHEL A.PRODUCTION3 08-16-12

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

__

V+

R20*R20

DEMO MANUAL DC1765A

3

OUT1-

J4

SMA-R

OUT1-

*

Z2*Z2

R2*R2

*

OUT2-

J5

SMA-R

OUT2-

*

Z3*Z3

R3*R3

*

R21*R21

OUT2+

J6

SMA-R

OUT2+

*

Z4*Z4

R4*R4

*

L

H

JP4

SD2

JP4

SD2

132

V+

www.linear.com

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

LTC6957HMS-1 / -2

TECHNOLOGY

BUFFER / DRIVER / LOGIC CONVERTER

IC NO. REV.

SCHEMATIC

LOW PHASE NOISE, DUAL LVPECL OR LVDS OUTPUT

SCHEMATIC

LOW PHASE NOISE, DUAL LVPECL OR LVDS OUTPUT

SCHEMATIC

LOW PHASE NOISE, DUAL LVPECL OR LVDS OUTPUT

SIZE

TITLE:

1

SHEET OF

DEMO CIRCUIT 1765A

2

08/16/2012, 06:45 PM

N/A

DATE:

KIM T.

MICHEL A.

APPROVALS

PCB DES.

APP ENG.

SCALE = NONE

3

OUT1+

8

9

OUT1-10OUT2-

7

OUT2+

SD2

R19

330k

11

12

R17

330k

R17

330k

3

SD1

*

GND

FILTA

JP1

C6

R6

J1

0.01uFC60.01uF

OPTR6OPT

IN+

U1U1

C13

0.1uF

C13

0.1uF

R7

49.9R749.9

SMA-R

1

R16

330k

R16

330k

E2E2

GND

E1E1

V+

4

5

3.15V - 3.45V

V+

C16

22uF

C16

22uF

D D

3528 10V

+

FILTA

H

C14

V+

132

L

1uF

IN-4IN+

FILTB

5

3V+2

C C

R11

OPT

6

V+

C8

R14

J2

V+

0.01uFC80.01uF

OPT

IN-

R18

FILTB

R15

49.9

R15

49.9

SMA-R

330k

H

132

JP2

L

OPT

R20-R21

0.01uF

Z1-Z4

130 OHM

R1-R4

CUSTOMER NOTICE

100 OHM

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

0 OHM

OPT

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

4

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

U1

LTC6957HMS-2-B

LTC6957HMS-1

5

LVDS

LVPECL

ASSY

-A

NOTE: UNLESS OTHERWISE SPECIFIED

*

B B

1. ALL RESISTORS AND CAPACITORS ARE 0603.

A A

dc1765af

Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

5

DEMO MANUAL DC1765A

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LT C from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LT C currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LT C application engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

6

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com

dc1765af

LT 0213 • PRINTED IN USA

 LINEAR TECHNOLOGY CORPORATION 2013

Linear Technology DC1765A Demo Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Description

Quick start proceDure

assembly options

parts list

schematic Diagram